Frank st



June 5, 1928. 1.672.546

F. sT. JOHN BRAKE Filed Dec. 17, 1926 INVENTOR FRABrxK AS'r JOHN u ATTORNEY Patented June 5, 192.8.

UNITED STATES PATENT FFECE.

FRANK ST. JOHN, F SOUTH BEND, INDIANA, ASSIGNOR TO DIX BRAKE COMPANY OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

BRAKE.

Application led December 17, 19264 Serial No. 155,367.

lwhich engage the' retarding means an which are swung by the retarding means when the brake is applied against suitable stops which may be in the form of adjustable set screws engaging the levers between their ends. I prefer to embody my novel anghoring means in a' brake having atleast three shoes with two of the above-described levers arranged at opposite ends of the intermediate shoe so that one of them is etfective when the drum is turning in one direction and the other is effective when the drum is turning in the yother direction. By this arrangement the intermediate shoe is applied in either direction of drum rotation by servo action through a connection from one of-the end shoes. The particular ,form of anchoring lever and stop shown in the drawing also embodies in its particular construction substantial novelty.

Thefbove and other objects and features i of the invention, including various novel and desirable structural details, will be apparent from the following description of one illustrative embodiment shown in the accompanying drawing, in which:

`Figure 1 is a vertical section through the.

brake just inside the head of the brake drum showing the brake shoes in side elevation;

Figure 2 is a partial radial section on the i line 2-2 of Figure 1, showing the'mounting of the above-described lever; and

Figure 3 is a partial radial section on the line 3-3 of Figure 1 showing the mounting preferred for the adjustable set screw or stop.

- The illustrated brake includes a suitable drum 10. rotating with the wheel (not shown) and which may be closed at its open side by a backing or dust plate 12. The fric tion means of the brake preferably includes three shoes 14,16, and 18, the end shoes 14 and 18 being connected to op osite ends of the intermediate shoe 16 by. oating plvots 22 having enlarged heads slidably'engagmg the backing plate 1'2. The brake is applied bylmeans such as av double cam 24 againsttheresistance of a return spring 26.

The present invention relates to the anJ choring meansjfor the shoes or their equivai lents. In the embodiment illustratd there are twoievers 28 facing in opposite directions at the opposite ends of the intermediate shoe 16 and forked to form arms straddling opposite ends of the shoe 16 and having semi-circular sockets to embrace the ends of the tioatingpivots 22. The two levers 28 eiiten'fiI *radially of the drurn and are fulcrumed on'pivots 30 carried by the backing plate l'2fmndarranged at the inner ends of the lever, and they arevalso, formed with ,offset thrust surfaces engaging adjustable set screws or equivalent stops 32 which may be threaded through brackets 34 secured t0 the backing plate 12. The levers 28 are urged against the stops 32 and the 'shoe' 16 is urged at its opposite ents zaway frointhe drum 10, by coil tensioirsprin'gs 36 connected at their opposite ends to theshoe 16l and to fingers projecting inwardly of the fulerums 30 of levers 2 As shown in Figure 2, each of the. levers 28 may have its fulcrum in 30 threaded into a sleeve 38 secured to t. e backing plate 12 by a cap screw 40.

In the operation of -the above-described brake, if the drum is turning inra counter# clockwise direction, as illustrated 1n Figure` 1, the left-hand lever 28 is held against itsf clockwise direction, the operation is reversed, and the torque ofA all three of the shoes ,is

taken on the left-hand stop 32 through the' left-hand lever 28. It will be observed that the levers 28 and the stops 32 and the brackets 34 and the pins 22 on .the right and left sides of vthe brake are interchangeable and that the shoes 14 and 18 are intercLhangeableiI lVhile one illustrativeembodiment-of the les? invention has hbeen described in detaih'it is i. -not my intention to limit. its scope `to that 1. A brake comprirJ g, in combination, a drum, an intermediate shoe and end shoesy engagcable with theA drum, means pivotally connecting the shoes, a lever :ii-ran red at each end of the intermediate shoe, and stops for the levers arranged to take the braking torque of the shoes.

2. A brake comprising, in combination, a drum, an intermediate shoe and end shoes engageable with the drum, a lever arranged at each end of the intermediate shoe, and sto -s for the levers -arranged'to take the bra ing tor'que of the shoes.

3. A brake com rising, in combination, a drum, a friction evice engageable with the drinn, a pair of levers arranged to be rocked by the friction device, and adjustable stops engaged by said levers and one or the other of which sto s takes the braking torque of the friction t evice. 1

4. A brake com rising, in combination, a drum, a friction evice engageable with the drum, a pair of radial Vlevers fulcrunied at their inner ends and arranged to be rocked by the friction device, and adjustable stops engaged by intermediate parte of said levers and one or the other of which'st'ops takes the brakin 1 torque of the friction device.

A bra e comprising, in combination, a. drum, a retarding device enga cable with the drum, a radial lever connecte to the retarding device at its outer end and fulcrumed at its inner end, and a stop engaged by the lever to take the torque'of theretarding device.

6. Abrake comprising, in combination, a drum, a retar'll 1g device engageahle with the drum, a lever connected to the retarding device, and a sto i engaged by the lever to take the torque of t ic ri-.tarding device.

7. brake compri-ing, in combination, a drum, a retarding device enga 'cable with the drun, a radial lever connecte to the retarddevice at its outer end and fulcrumed at its inner end, and a stop engaged by the lever to take the torque of the retat'ding device when tlie drinn is turning in one direction, together with means separate from said lever' for taking the torque of the rctarding device when thc di'unr turning in the opposite direction.

8. A brake comprising in combination, a drinn, a rctarding device itgageable with the drinn, a levier cornici-.ted to the retarding devic/c, and a stop engaged by the lever to take the torque of the retarding device when the drum is turning` in. one direction, together with' means separate from said lever for taking the torque of vthe retarding device when the drum is turning iii the opposite direction.

9. A brake comprising, in combination, at

least tlireeishoes arranged end to end and .connected by pivots, oppositely facing piv oted levers pivotally engaging vsaid ivota, and stops engaged by the levers to ta e the brakin f tort ue of the shoes: l

1U. i bra ecomlprising, in combination, at least three shoes arranged end lto end and connected by pivots, and means including oppositely facing pivoter] levers Yivotally engaging said pivots and arrange( to take the v braking tor ue of tlieshoes.

11. A/ bra ve comprising, in combination, at least three shoes arranged end to end and connected by pivots', oppositely facing pivoted levers pivotally engagingsaid pivots, and adjustable stops engaged by the levers to take the braking torque of thefshoes.

l2. A brake comprising, in combination, at least three shoes arranged end to end and connectedby pivots, oppositely facing pivoted4 levers ivotally engagingv Said iivots, and iidjusta le set screws engaged iy the levers to take the braking torque of the shoes. A

FRANK ST. JOHN.

In testimony whereof, I have-hereunto' 

